drm/i915/vga: Extract intel_gmch_ctrl_reg()

Extract the GMCH_CTLR register offset determination into a helper
rather than using a local varaible. I'll be needing this in another
function soon.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patch.msgid.link/20251208182637.334-5-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Ville Syrjälä 2025-12-08 20:26:22 +02:00
commit d4470842e4